/Engine/Source/Runtime/Online/HTTP/Public/Interfaces/IHttpResponse.h
Response codes that can come back from an Http request
namespace EHttpResponseCodes { enum Type { Unknown = 0, Continue = 100, SwitchProtocol = 101, Ok = 200, Created = 201, Accepted = 202, Partial = 203, NoContent = 204, ResetContent = 205, PartialContent = 206, Ambiguous = 300, Moved = 301, Redirect = 302, RedirectMethod = 303, NotModified = 304, UseProxy = 305, RedirectKeepVerb = 307, BadRequest = 400, Denied = 401, PaymentReq = 402, Forbidden = 403, NotFound = 404, BadMethod = 405, NoneAcceptable = 406, ProxyAuthReq = 407, RequestTimeout = 408, Conflict = 409, Gone = 410, LengthRequired = 411, PrecondFailed = 412, RequestTooLarge = 413, UriTooLong = 414, UnsupportedMedia = 415, TooManyRequests = 429, RetryWith = 449, ServerError = 500, NotSupported = 501, BadGateway = 502, ServiceUnavail = 503, GatewayTimeout = 504, VersionNotSup = 505, } }